Overview of DOverview of DB2 Database South Africa Management SystemsB2 Database South Africa Management Systems
                     Overview of DB2 
Database South Africa 
Management Systems
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DB2 Database Management Systems 
abbreviated as DBMS and can be categorized 
based on type as Hierarchical, Network, 
Object-Oriented and Relational systems. In 
hierarchical databases, data is structured in 
the form of a top-down tree, where a parent 
node has multiple child nodes. Network DB is 
very similar to a hierarchical database, except 
for a child node can have multiple parent 
nodes, thus forming a network as opposed to a 
hierarchical tree. 
Relational DBS is the most commonly used, 
where data is structured as rows and 
columns in tables and relations specified 
between tables. The DB2 Database South 
Africa enables the usage of multimedia 
(audio, video, pictures, etc) referred to as 
objects and also comprises a set of 
instructions in the form of software 
programs allowing operations on those 
objects.
Today, the most popular and widely used 
DB2 Database South Africa are relational 
databases, allowing ease in the retrieval of 
stored data. Examples of relational DB are 
Microsoft SQL Server, Microsoft Access, 
Oracle, IBM DB2 etc. Relational DB allows 
rapid data storage and retrieval. Data 
structures can be defined to manage 
information flow and business operations. 
Also, in a relational DB integrity constraints may 
be defined to restrict data type, access, 
capacity, property, etc in any field. In every 
table, a set of constraints determine how and 
where data from that table can be used. Using 
keys data in a particular column can be defined 
to contain unique values; this type of key is 
called a primary key. A foreign key can be 
referred to from another table. There are many 
other types of keys that can be used on 
columns of a table.
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